Johan Hovold cf3c30a711 serdev: ttyport: restore client ops on deregistration ... commit 0c5aae5927 upstream. The serdev tty-port controller driver should reset the tty-port client operations also on deregistration to avoid a NULL-pointer dereference in case the port is later re-registered as a normal tty device. Note that this can only happen with tty drivers such as 8250 which have statically allocated port structures that can end up being reused and where a later registration would not register a serdev controller (e.g. due to registration errors or if the devicetree has been changed in between). Specifically, this can be an issue for any statically defined ports that would be registered by 8250 core when an 8250 driver is being unbound. Fixes: bed35c6dfa ("serdev: add a tty port controller driver") Cc: stable <stable@vger.kernel.org> # 4.11 Reported-by: Loic Poulain <loic.poulain@linaro.org> Signed-off-by: Johan Hovold <johan@kernel.org> Link: https://lore.kernel.org/r/20200210145730.22762-1-johan@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2020-02-28 17:22:19 +01:00
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Kconfig	tty: add SPDX identifiers to Kconfig and Makefiles	2019-04-04 18:48:43 +02:00
Makefile	tty: add SPDX identifiers to Kconfig and Makefiles	2019-04-04 18:48:43 +02:00
core.c	serdev: Don't claim unsupported ACPI serial devices	2020-01-14 20:08:32 +01:00
serdev-ttyport.c	serdev: ttyport: restore client ops on deregistration	2020-02-28 17:22:19 +01:00